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Disclosery

KRRO KORRO BIO INC

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COMMON STOCK (common), issuer CIK 1703647

90 managers (92 13F filers) reported a position in KRRO shares at 2025-09-30, 9,764,120 shares in all. 26 filers opened a position and 5 filers sold out during the quarter.

Managers
90
13F filers
92
New
26
Added
29
Reduced
20
Sold out
5
Shares held by filers
9,764,120

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
Atlas Venture Life Science Advisors, LLC1,137,149$54.5M7.24%013F-HRTimeline
NEA Management Company, LLC1,090,793$52.2M2.87%013F-HRTimeline
Driehaus Capital Management LLC671,981$32.2M0.23%+91,12213F-HRTimeline
FMR LLCin group FMR LLC563,681$27M<0.01%-75,54113F-HRTimelineGroup
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.531,969$25.5M0.06%-8,10513F-HRTimelineGroup
Cormorant Asset Management, LP465,000$22.3M1.54%013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.446,698$21.4M<0.01%-15,19113F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.418,833$20.1M0.78%013F-HRTimelineGroup
TCG Crossover Management, LLC416,301$19.9M0.98%new13F-HRTimeline
VANGUARD GROUP INCin group VANGUARD GROUP INC395,659$18.9M<0.01%+8,92113F-HRTimelineGroup
QIMING U.S. VENTURES MANAGEMENT, LLC368,085$17.6M31.68%013F-HRTimeline
Tri Locum Partners LP337,764$16.2M3.72%+198,27113F-HRTimeline
72 Investment Holdings, LLC276,831$13.3M19.51%013F-HRTimeline
Polar Capital Holdings Plcin group Polar Capital Holdings Plc264,694$12.7M0.06%+14,69413F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC260,333$12.5M0.01%+4,65013F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO199,249$9.54M<0.01%+196,07913F-HR/ATimelineGroup
MORGAN STANLEYin group MORGAN STANLEY167,494$8.02M<0.01%+85,76113F-HR/ATimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC162,932$7.8M<0.01%+7,54513F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC153,928$7.37M0.01%-196,71813F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC148,971$7.13M<0.01%+65,57913F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP124,569$5.97M<0.01%+2,62913F-HRTimelineGroup
Blue Owl Capital Holdings LP105,000$5.03M1.56%-20,00013F-HRTimeline
Schonfeld Strategic Advisors LLC90,186$4.32M0.03%new13F-HRTimeline
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding75,864$3.63M+39,118Timeline
EMERALD ADVISERS, LLCgroup of 2 filers holding75,380$3.61MnewTimeline
DAFNA Capital Management LLC60,804$2.91M0.72%+3,11313F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc57,983$2.78M<0.01%-26,44513F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP57,273$2.74M<0.01%-59513F-HRTimelineGroup
F/m Investments LLC55,245$2.65M0.1%new13F-HRTimeline
UBS Group AGin group UBS Group AG53,103$2.54M<0.01%+34,52213F-HRTimelineGroup
Woodline Partners LP50,094$2.4M0.01%013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC48,407$2.32M<0.01%new13F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC40,400$1.93M<0.01%-5,30013F-HRTimeline
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC40,235$1.93M0.19%-28,58013F-HRTimelineGroup
Trexquant Investment LP38,260$1.83M0.02%+17,39013F-HRTimeline
Rock Springs Capital Management LP35,719$1.71M0.1%013F-HRTimeline
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC32,400$1.55M0.04%013F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co23,101$1.11M<0.01%+5,32513F-HRTimelineGroup
Eversept Partners, LP20,856$999K0.08%new13F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp19,313$925K<0.01%+2,79113F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC15,681$751K<0.01%new13F-HRTimelineGroup
BLAIR WILLIAM & CO/IL9,750$467K<0.01%new13F-HRTimeline
RHUMBLINE ADVISERS9,343$447K<0.01%-16813F-HRTimeline
Nuveen, LLCin group TIAA9,264$444K<0.01%new13F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC8,757$419K<0.01%new13F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.7,700$369K<0.01%new13F-HRTimeline
ALGERT GLOBAL LLC7,108$340K0.01%new13F-HR/ATimeline
Quantinno Capital Management LP6,143$294K<0.01%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA5,992$287K<0.01%-61313F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN5,170$248K<0.01%+83713F-HRTimelineGroup
Wealth Forward, LLC5,009$240K0.14%new13F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/4,704$225K<0.01%-23,45213F-HR/ATimelineGroup
Quarry LP4,375$210K0.05%-12513F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…3,945$189K<0.01%new13F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\3,731$179K<0.01%+11513F-HRTimelineGroup
Arax Advisory Partners3,610$173K<0.01%new13F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…3,138$150K<0.01%-36413F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND3,000$144K<0.01%013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…2,914$140K<0.01%new13F-HRTimelineGroup
CWM, LLCin group CWM, LLC2,693$129K<0.01%+2,14513F-HRTimelineGroup
AlphaQuest LLC2,468$118K0.01%-24,74313F-HRTimeline
Police & Firemen's Retirement System of…2,286$109K<0.01%+1,06013F-HRTimeline
North Star Investment Management Corp.1,800$86.2K0.01%013F-HRTimeline
Steward Partners Investment Advisory, L…1,750$83.8K<0.01%+60013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS1,314$62.9K<0.01%+66113F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,038$49.7K<0.01%-1,67113F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…815$39K<0.01%new13F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…598$28.6K<0.01%013F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc526$25.2K<0.01%013F-HRTimelineGroup
Sterling Capital Management LLC458$21.9K<0.01%+33713F-HRTimeline
DUNCKER STREETT & CO INC437$20.9K<0.01%013F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…416$19.9K<0.01%-2613F-HRTimeline
Essential Partners LLC394$18.9K0.01%+39113F-HRTimeline
CITIGROUP INCin group CITIGROUP INC337$16.1K<0.01%-2,14713F-HRTimelineGroup
Versant Capital Management, Inc271$13K<0.01%-1113F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.280$12K<0.01%+27913F-HRTimelineGroup
AMALGAMATED BANK211$10K<0.01%013F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.116$5.55K<0.01%new13F-HRTimelineGroup
Allworth Financial LP92$4.41K<0.01%new13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…89$4.26K<0.01%+6713F-HRTimelineGroup
GAMMA Investing LLC89$4.26K<0.01%+2313F-HRTimeline
NISA INVESTMENT ADVISORS, LLC83$3.98K<0.01%+5313F-HRTimeline
Wealthspire Advisors, LLC65$3.11K<0.01%new13F-HRTimeline
IFP Advisors, Inc40$1.92K<0.01%+4013F-HR/ATimeline
True Wealth Design, LLC19$910<0.01%new13F-HRTimeline
Clearstead Advisors, LLC18$863<0.01%new13F-HRTimeline
MAI Capital Management5$240<0.01%013F-HRTimeline
NORTHWESTERN MUTUAL WEALTH MANAGEMENT COin group NORTHWESTERN MUTUAL INVESTMEN…2$96<0.01%013F-HRTimelineGroup
SBI Securities Co., Ltd.1$48<0.01%-613F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd43,538$00%new13F-HRTimelineGroupValue filed as zero, left out of ratios.